Construction of double-walled metal tanks.



H. V. BRADY. CQNSTRUCTION 0F DOUBLE WALL ED METAL TANKS. APPLICATIONFILED MAY 23.. 1911.

1 262,UQ9 I Patented Apr. 9, 1918.

c- QFEIQ INVENTO J Ydrry 7/ Zrady A TTORJVE Y HEY V. BRADY, OFFRAMINGHAM, MASSACHUSETTS.

CONSTRUCTION OF DOUBLE-WALLED METAL TANKS.

Specification of Letters Patent.

Patented Apr. 31918.

Application filed May 23, 1917. Serial No. 170,387.

To all whom it may concern:

Be it known that HARRY V. BRADY, a citizen of Canada and subject of theKing of England, residing at Framingham, in the county of Middlesex andState of Massachusetts, has invented certain new and useful Improvementsin the Construction of Double-WValled Metal Tanks, of which thefollowing is a specification. Y

The structure embodying this invention may be used for various purposesbut for the sake of clearness it will be here considered a steam-heatedtank of that sort wherein an inner vessel or container'is surrounded bya jacket spaced away therefrom to form the steam chamber.

The Walls of the container are under S ress of compression and must besuitably reinforced. It has been the practice to use staybolts for thispurpose and permit their heads to protrude from the inner surface of thecontainer. These projecting heads are in some instances subject to wearas in tankage driers and in that event leakage about the bolts soonensues. Said projecting heads are often objectionable for other reasons.

The present invention overcomes all these objections and consists in thestructure of parts and their combination substantially as herein setforth and claimed.

In the accompanying drawings Figure 1 represents in longitudinal axialsection one end of a tankage drier embodying this invention while Fig. 2is a transverse section thereof on the line 2-2; Fig. 3 is a view likeFig. 1 and shows a modification of the reinforcing means while Fig. 4:is a transverse section thereof on the line,33; Figs. 5 and 6 are enlared detail views showing the manner of app ying staybolts.

In the main the illustrations are simply typical of any double-walledstructure of the class in question. The inner vessel or container isrepresented at 7 the jacket at 8 the intake at 9 the outlet at 10 andthe steam ports at 11. The walls 7 and 8 may be spaced apart and joinedat their ends by a ring 12. The intake and outlet are preferably formedsignature.

by flanging out the Wall 7 at 13 inserting thro gh the wall 8 a flangedring 14 to meet thelfiange 13 and overlapping the jointby a collar 15and Welding all joints. The nipples at the steam ports arealsopreferably welded in place.

Compression resisting hoops or rings 16, Figs. 1 and 2, are added to thecontainer and are preferably welded to the same. These rings are drilledand tapped and staybolts 17 are inserted through wall 8 and screweddown, firmly. to thebottoms of the holes, Fig. 5, which their ends areshaped to fit. The bolts are then headed over as in Fig. 6.

While the employment of staybolts as described insures greater strengththey may in some instances be omitted and the rings or hoops made ofT-bars 18 and welded by their broad sides to the container as indicatedin Figs. 3 and 4. By the use of either of these reinforcing means therequired strength is added to the container without puncturing its wallor interfering with the smooth inner surface thereof.

' The invention-claimed is 1. In a double-Walled vessel, the combinationof an inner Wall whose inner surface is imperforate and uninterruptedsave at inlet and outlet of the vessel, reinforcing hoops secured to theouter surface only of said inner wall, an outer wall, and stayboltspassedthrough the outer Wall and screwed into sockets in said hoops,substantially as and for the purpose set forth.

2. In a double-Walled vessel, the combination of an inner wall whoseinner surface is imperforate and uninterrupted save at the vessels inletand outlet, projections welded to the outer surface of said inner walland having threaded 'staybolt sockets therein, an outer wall, andstaybolts inserted through said outer Wall, turned in to the bottom ofsaid threaded sockets and headed over against the outer wall,substantially as and for the purpose set forth.

In testimony whereof I have affixed my A 1! BY V. BRADY.

